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SECTION 2 SIGNAL DESCRIPTION This section contains descriptions of the input and output signals. The input and output signals can be functionally organized into groups as shown in Figure 2-1. The following paragraphs provide a brief description of the signal and a reference (if applicable) to other sections that contain more detail about its function. NOTE Assertion and negation are used to specify forcing a signal to a particular state. Assertion and assert refer to a signal that is active or true. Negation and negate refer to a signal that is inactive or false. These terms are used independently of the voltage level (high or low) that they represent. POWER SUPPLY VCC GND GPIP CLK D0 – D7 ASYNCHRONOUS BUS CONTROL DATA BUS CS DS R/W DTACK RS1 – RS5 MC68HC901 MULTI-FUNCTION PERIPHERAL (MFP) TAI TBI TAO TBO TCO TDO XTAL1 XTAL2 TIMER CONTROL SI SO RC TC SERIAL I / O CONTROL RR TR DMA CONTROL REG SEL RESET INTERRUPT CONTROL I0 – I7 IRQ IACK IEI IEO Figure 2-1. Input and Output Signals 2.1 POWER SUPPLY (VCC and GND) FIGURE - INPUT AND OUTPUT SIGNALS / AD Power is supplied to the MFP using theseMC68HC901UM connections. The VCC pin is powered at +5 volts, and ground is connected to the GND pins. MOTOROLA MC68HC901 USER’S MANUAL 2-1
